Dojo Cannot Read Property 'on' of null

[ShawnRoberts1]

I've got an interesting one I've been trying to figure out, but having no luck. Hopefully someone else can shed some light.

I've got a little chunk of code that is watching for a button click on a popup. When it's clicked it fires a function. It works great on a desktop, however I'm finding on mobile devices/tablets i'm getting the Cannot read property'on' of null error. 

I imagine I'm just missing something in the require, or something silly but it's a bit of a mystery to me at this point.

This is the code. It's just the view watching for a click on the "viewDetailsPopupButton", which ,of course ,is embedded in a popup. The error is obviously firing on the "on(dom.byId...)" . I'm just not sure why dom.byID is null? 

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Any guesses, or help would be very much appreciated!

[ShawnRoberts1 · Accepted solution]

Fixed my own problem.

Callbacks and requires were in the wrong order.